Walnut peptide and theanine combination (WPT) improves sleep disorders in adults with poor sleep quality
In an 8-week randomized, placebo-controlled human trial, WPT restored sleep duration and improved subjective sleep quality scores as assessed by the Pittsburgh Sleep Quality Index (PSQI) in adults with PSQI ≥ 7. The intervention also reduced waking activity in zebrafish and restored slow-wave sleep duration and delta wave power density in CUMS mice, while lowering serum corticosterone and increasing GABA and tryptophan levels.
This article is automatically generated from the structured evidence profile behind the claim above. Scores reflect the quality and quantity of available research, not clinical advice.
Walnut peptide and theanine combination (WPT) improves sleep disorders in adults with poor sleep quality The current body of evidence comprises 1 study, including 1 randomized controlled trial. EvidenceHub rates the overall confidence at 42/100 (low).
The Claim
Walnut peptide and theanine combination (WPT) improves sleep disorders in adults with poor sleep quality
This conclusion is most relevant to: Adults with sleep disturbances (PSQI ≥ 7), CUMS mice, PTZ-induced zebrafish.
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Walnut peptide and theanine combination ameliorates sleep disorders: a multi-species study including a human trial. (Food & function, 2026) —
How It Works
The proposed biological pathway:
- ▸WPT lowers elevated serum corticosterone levels
- ▸WPT increases inhibitory neurotransmitter GABA
- ▸WPT increases tryptophan, a precursor for serotonin and melatonin
- ▸Result: Restored slow-wave sleep duration and improved sleep quality
Who Might Benefit
Evidence fit by population:
- ▸Adults with sleep disturbances (PSQI ≥ 7), CUMS mice, PTZ-induced zebrafish
Recommended Dose
N/A
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Abstract does not specify exact dose of WPT used in the human trial
- ▸Abstract does not report effect sizes or confidence intervals for human outcomes
- ▸Multi-species design may limit direct translation of animal findings to humans
Frequently Asked Questions
What is WPT?▼
WPT stands for walnut peptide and theanine combination, a nutritional intervention tested for sleep improvement.
Who was studied in the human trial?▼
Adults with poor sleep quality, defined as a Pittsburgh Sleep Quality Index (PSQI) score of 7 or higher.
How long was the human trial?▼
The human trial lasted 8 weeks and was randomized and placebo-controlled.
What mechanisms did WPT affect?▼
WPT reduced serum corticosterone (a stress hormone) and increased levels of GABA and tryptophan, which are involved in sleep regulation.
References
- 1.Gong J, Jia X, Wang L, Lu Y, Guo R, Gong R, Hao J, Zhao Z, Duan S, Liu X, He J, Li H, Liu Z. “Walnut peptide and theanine combination ameliorates sleep disorders: a multi-species study including a human trial..” Food & function, 2026. PMID: 41531275 DOI: 10.1039/d5fo03867g